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Reliever Karns dealing with right leg injury

VIERA, Fla. -- Nationals right-hander Nathan Karns had his toughest outing of the spring Friday against the Cardinals, allowing seven runs (one earned) in two-thirds of an inning.

After the game, manager Davey Johnson revealed that Karns has been dealing with a right leg issue, which dates back to March 2 against St. Louis. Johnson said Karns will likely see a doctor on Sunday.

"It's an issue, so we are probably going to have the doctors check him," Johnson said. "It doesn't feel right. He said it was something he has pitched with, but it's not normal for a guy to have to feel something uncomfortable in his right leg when he pushes off."